Opteka EW-83E Lens Hood for Canon EF 10-22mm f/2.8L, EF 17-35mm f/2.8L, EF 17-40mm f/4L Lenses Replacement for Canon EW-83E Lens Hood Compatible with the Canon EF 16-35mm f/2.8L, EF 17-35mm f/2.8L, & EF 17-40mm f/4L Lenses Prevent unwanted stray light from entering the lens Extra protection from accidental impact Designed to match the specific focal length of the lens